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Mineral Properties - Exploration Expense (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Notes to Financial Statements        
Geologic and field expenses $ 247,000 $ 334,000 $ 493,000 $ 571,000
Administrative 89,000 75,000 205,000 193,000
Mt. Hamilton exploration and development    145,000    314,000
Total exploration costs $ 336,000 $ 554,000 $ 698,000 $ 1,078,000